By studying pea plants, Mendel discovered that purple flowers (P) are dominant to white flowers (p), yellow seeds (Y) are dominant to green seeds (y), and round seeds (R) are dominant to wrinkled seeds (r). When a gamete is formed from a plant that is heterozygous for all traits, there are several different allele combinations possible for the resulting gamete. What causes this phenomenon? Alleles for different genes assort independently from each other during gamete formation. O Incomplete dominance of alleles allows numerous combinations. O During gamete formation, alleles for the same gene separate from each other. When alleles are present on linked genes, they separate into numerous combinations during meiosis.
By studying pea plants, Mendel discovered that purple flowers (P) are dominant to white flowers (p), yellow seeds (Y) are dominant to green seeds (y), and round seeds (R) are dominant to wrinkled seeds (r). When a gamete is formed from a plant that is heterozygous for all traits, there are several different allele combinations possible for the resulting gamete. What causes this phenomenon? Alleles for different genes assort independently from each other during gamete formation. O Incomplete dominance of alleles allows numerous combinations. O During gamete formation, alleles for the same gene separate from each other. When alleles are present on linked genes, they separate into numerous combinations during meiosis.
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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The three laws of Mendel are:
- Law of dominance - Only the dominant gene expresses itself. The recessive gene gets suppressed
- Law of segregation - According to the law of segregation, only one of the two gene copies present in an organism is distributed to each gamete (egg or sperm cell) that it makes, and the allocation of the gene copies is randomWhen the sperm cell and egg cell unite during fertilization, the DNA from each cell is combined so that the offspring has two copies of each gene.
- Law of independent assortment - Mendel's law of independent assortment states that the alleles of two (or more) different genes get sorted into gametes independently of one another. In other words, the allele a gamete receives for one gene has no influence on the allele received for another gene.
Incomplete dominance is a modification of Mendel's laws which states that when a dominant allele is present; it or does not completely mask the effects of a recessive allele, and the organism's shows a blending of both the dominant and recessive alleles. It is also called semi-dominance or partial dominance.
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